Enhanced thermopower of graphene films with oxygen plasma treatment

Ni Xiao; Xiaochen Dong; Li Song; Dayong Liu; Yeeyan Tay; Shixin Wu; Lain Jong Li; Yang Zhao; Ting Yu; Hua Zhang; Wei Huang; Huey Hoon Hng; Pulickel M. Ajayan; Qingyu Yan

doi:10.1021/nn2001849

Enhanced thermopower of graphene films with oxygen plasma treatment

Ni Xiao, Xiaochen Dong, Li Song, Dayong Liu, Yeeyan Tay, Shixin Wu, Lain Jong Li, Yang Zhao, Ting Yu, Hua Zhang, Wei Huang, Huey Hoon Hng, Pulickel M. Ajayan, Qingyu Yan

Research output: Contribution to journal › Article › peer-review

180 Scopus citations

Abstract

In this work, we show that the maximum thermopower of few layers graphene (FLG) films could be greatly enhanced up to ∼700 μV/K after oxygen plasma treatment. The electrical conductivities of these plasma treated FLG films remain high, for example, ∼10⁴ S/m, which results in power factors as high as ∼4.5 × 10^-3 W K^-2 m ^-1. In comparison, the pristine FLG films show a maximum thermopower of ∼80 μV/K with an electrical conductivity of ∼5 × 10 ⁴ S/m. The proposed mechanism is due to generation of local disordered carbon that opens the band gap. Measured thermopowers of single-layer graphene (SLG) films and reduced graphene oxide (rGO) films were in the range of -40 to 50 and -10 to 20 μV/K, respectively. However, such oxygen plasma treatment is not suitable for SLG and rGO films. The SLG films were easily destroyed during the treatment while the electrical conductivity of rGO films is too low.

Original language	English (US)
Pages (from-to)	2749-2755
Number of pages	7
Journal	ACS Nano
Volume	5
Issue number	4
DOIs	https://doi.org/10.1021/nn2001849
State	Published - Apr 26 2011
Externally published	Yes

Keywords

graphene film
oxygen plasma
thermopower

ASJC Scopus subject areas

General Materials Science
General Engineering
General Physics and Astronomy

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10.1021/nn2001849

Cite this

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title = "Enhanced thermopower of graphene films with oxygen plasma treatment",

abstract = "In this work, we show that the maximum thermopower of few layers graphene (FLG) films could be greatly enhanced up to ∼700 μV/K after oxygen plasma treatment. The electrical conductivities of these plasma treated FLG films remain high, for example, ∼104 S/m, which results in power factors as high as ∼4.5 × 10-3 W K-2 m -1. In comparison, the pristine FLG films show a maximum thermopower of ∼80 μV/K with an electrical conductivity of ∼5 × 10 4 S/m. The proposed mechanism is due to generation of local disordered carbon that opens the band gap. Measured thermopowers of single-layer graphene (SLG) films and reduced graphene oxide (rGO) films were in the range of -40 to 50 and -10 to 20 μV/K, respectively. However, such oxygen plasma treatment is not suitable for SLG and rGO films. The SLG films were easily destroyed during the treatment while the electrical conductivity of rGO films is too low.",

keywords = "graphene film, oxygen plasma, thermopower",

author = "Ni Xiao and Xiaochen Dong and Li Song and Dayong Liu and Yeeyan Tay and Shixin Wu and Li, {Lain Jong} and Yang Zhao and Ting Yu and Hua Zhang and Wei Huang and Hng, {Huey Hoon} and Ajayan, {Pulickel M.} and Qingyu Yan",

year = "2011",

month = apr,

day = "26",

doi = "10.1021/nn2001849",

language = "English (US)",

volume = "5",

pages = "2749--2755",

journal = "ACS Nano",

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T1 - Enhanced thermopower of graphene films with oxygen plasma treatment

AU - Xiao, Ni

AU - Dong, Xiaochen

AU - Song, Li

AU - Liu, Dayong

AU - Tay, Yeeyan

AU - Wu, Shixin

AU - Li, Lain Jong

AU - Zhao, Yang

AU - Yu, Ting

AU - Zhang, Hua

AU - Huang, Wei

AU - Hng, Huey Hoon

AU - Ajayan, Pulickel M.

AU - Yan, Qingyu

PY - 2011/4/26

Y1 - 2011/4/26

N2 - In this work, we show that the maximum thermopower of few layers graphene (FLG) films could be greatly enhanced up to ∼700 μV/K after oxygen plasma treatment. The electrical conductivities of these plasma treated FLG films remain high, for example, ∼104 S/m, which results in power factors as high as ∼4.5 × 10-3 W K-2 m -1. In comparison, the pristine FLG films show a maximum thermopower of ∼80 μV/K with an electrical conductivity of ∼5 × 10 4 S/m. The proposed mechanism is due to generation of local disordered carbon that opens the band gap. Measured thermopowers of single-layer graphene (SLG) films and reduced graphene oxide (rGO) films were in the range of -40 to 50 and -10 to 20 μV/K, respectively. However, such oxygen plasma treatment is not suitable for SLG and rGO films. The SLG films were easily destroyed during the treatment while the electrical conductivity of rGO films is too low.

AB - In this work, we show that the maximum thermopower of few layers graphene (FLG) films could be greatly enhanced up to ∼700 μV/K after oxygen plasma treatment. The electrical conductivities of these plasma treated FLG films remain high, for example, ∼104 S/m, which results in power factors as high as ∼4.5 × 10-3 W K-2 m -1. In comparison, the pristine FLG films show a maximum thermopower of ∼80 μV/K with an electrical conductivity of ∼5 × 10 4 S/m. The proposed mechanism is due to generation of local disordered carbon that opens the band gap. Measured thermopowers of single-layer graphene (SLG) films and reduced graphene oxide (rGO) films were in the range of -40 to 50 and -10 to 20 μV/K, respectively. However, such oxygen plasma treatment is not suitable for SLG and rGO films. The SLG films were easily destroyed during the treatment while the electrical conductivity of rGO films is too low.

KW - graphene film

KW - oxygen plasma

KW - thermopower

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DO - 10.1021/nn2001849

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AN - SCOPUS:79955375372

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EP - 2755

JO - ACS Nano

JF - ACS Nano

IS - 4

ER -

Enhanced thermopower of graphene films with oxygen plasma treatment

Abstract

Keywords

ASJC Scopus subject areas

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